91442261237 has 2 divisors, whose sum is σ = 91442261238. Its totient is φ = 91442261236.

The previous prime is 91442261227. The next prime is 91442261327. The reversal of 91442261237 is 73216224419.

Together with next prime (91442261327) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75888679441 + 15553581796 = 275479^2 + 124714^2 .

It is a cyclic number.

It is not a de Polignac number, because 91442261237 - 2³⁰ = 90368519413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91442261194 and 91442261203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91442261227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45721130618 + 45721130619.

It is an arithmetic number, because the mean of its divisors is an integer number (45721130619).

Almost surely, 2^91442261237 is an apocalyptic number.

It is an amenable number.

91442261237 is a deficient number, since it is larger than the sum of its proper divisors (1).

91442261237 is an equidigital number, since it uses as much as digits as its factorization.

91442261237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The spelling of 91442261237 in words is "ninety-one billion, four hundred forty-two million, two hundred sixty-one thousand, two hundred thirty-seven".